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O G Sá Filho et al.
Journal of animal science, 87(6), 1981-1990 (2009-03-17)
Five experiments were conducted on commercial farms in Brazil designed to develop the basis for an estrus synchronization protocol using melengestrol acetate (MGA) in Bos indicus cattle. These studies resulted in the development of the following protocol: 0.5 mg x
Bernard G Steinetz et al.
American journal of veterinary research, 69(1), 59-67 (2008-01-03)
To determine whether abnormal laxity of hip joints of canine pups with genetic predisposition to hip dysplasia (HD+) is related to ingestion of milk-borne hormones. 7 female Labrador Retrievers with HD+ and 8 with low predisposition to hip dysplasia (HD-)
G A Perry et al.
Journal of animal science, 86(11), 2928-2935 (2008-07-22)
Cows that exhibit estrus within 24 h of fixed-time AI have elevated concentrations of estradiol and greater pregnancy rates compared with cows not in estrus. Our objective was to determine whether estradiol, estrus, or both had an effect on uterine
Morgan D Ashworth et al.
Animal reproduction science, 122(3-4), 215-221 (2010-09-21)
In pigs, administration of estrogen to gilts on Days 9 and 10 of pregnancy causes conceptus fragmentation and death between Days 15 and 18 of gestation. Conceptus degeneration is associated with breakdown of the microvilli surface glycocalyx on the lumenal
K N Galvão et al.
Journal of dairy science, 90(9), 4212-4218 (2007-08-19)
The objective was to determine if reducing the interval from presynchronization to the first GnRH injection (G1) of a timed artificial insemination (AI) protocol improves pregnancy per AI. One thousand two hundred fourteen Holstein cows, at 37 +/- 3 d
María Angeles De Santiago-Miramontes et al.
Tropical animal health and production, 43(8), 1595-1600 (2011-04-12)
This study was conducted to determine whether flushing or the stimulus of estrogenized goats is necessary to achieve a high reproductive response in anestrous goats on rangeland. Does were feed-supplemented on rangeland (flushed, n = 20). Other group was exposed
María V Cavilla et al.
Acta veterinaria Scandinavica, 52, 13-13 (2010-02-13)
Llamas (Lama glama) are induced ovulators and the process of ovulation depends on dominant follicular size. In addition, a close relationship between behavioural estrus and ovulation is not registered in llamas. Therefore, the exogenous control of follicular development with hormones
Morgan D Ashworth et al.
Reproductive toxicology (Elmsford, N.Y.), 34(1), 8-15 (2012-04-14)
Estrogen prepares the uterus for implantation and is highly conserved in mammals. However, administration of estrogen to pigs earlier than normal conceptus secretion is characterized by complete embryonic mortality by days 15-18. The objective of this study was to characterize
J N S Sales et al.
Theriogenology, 78(3), 510-516 (2012-04-17)
The effects of estradiol benzoate (EB) and estradiol cypionate (EC) on induction of ovulation after a synchronized LH surge and on fertility of Bos indicus females submitted to timed AI (TAI) were evaluated. In Experiment 1, ovariectomized Nelore heifers were
M Meneghetti et al.
Theriogenology, 72(2), 179-189 (2009-04-07)
Five experiments were conducted on commercial farms in Brazil aiming to develop a fixed-time artificial insemination (TAI) protocol that achieved pregnancy rates between 40% and 55% in Bos indicus cows. These studies resulted in the development of the following protocol:
M G Colazo et al.
Theriogenology, 71(6), 984-992 (2009-01-10)
We hypothesized that: (i) repeated GnRH treatments would increase the magnitude and duration of the LH surge and would increase progesterone (P4) concentrations after ovulation; and (ii) the release of pituitary LH would be greater in response to larger doses
Jason W Ross et al.
Endocrinology, 148(10), 4761-4773 (2007-07-21)
Establishment and maintenance of pregnancy in the pig involve intricate communication between the developing conceptuses and maternal endometrium. Conceptus synthesis and release of estrogen during trophoblastic elongation are essential factors involved with establishing conceptus-uterine communication. The present study identified endometrial
Ronaldo L A Cerri et al.
Reproduction (Cambridge, England), 137(5), 813-823 (2009-02-11)
Length of dominance of the ovulatory follicle and exposure to oestradiol (OE(2)) during proestrus can affect fertility. Lactating cows had their oestrous cycle pre-synchronized and were subjected to one of the four synchronization treatments. Cows in the oestrus detection (OD)
Morgan D Ashworth et al.
Reproductive biology and endocrinology : RB&E, 8, 33-33 (2010-04-13)
The role for endometrial secretion of cytokines during the establishment of pregnancy in a number of mammals is well established. The current study determined endometrial expression of caspase 1 (CASP1) and interleukin-18 (IL18) during the estrous cycle and early pregnancy
A D P Rodrigues et al.
Theriogenology, 79(1), 135-141 (2012-11-06)
Four experiments were conducted to evaluate hormonal strategies to induce ovulation in Nellore heifers. In experiment 1, heifers (N = 1039) received a controlled internal drug release (CIDR) of fourth use (CIDR-4) on Day -12 or no CIDR (CIDR-0). The
M Sarkar et al.
Animal reproduction science, 104(2-4), 299-305 (2007-03-27)
The objective of this study was to test the efficacy of induction of estrus, synchronization of ovulation and timed artificial insemination in anestrous yaks using the Heatsynch protocol. In Experiment 1, 10 anestrous yaks were administered an analogue of gonadotropin
G A Perry et al.
Domestic animal endocrinology, 34(3), 333-338 (2007-11-06)
Previous studies have indicated that initiation of standing estrus within 24h of fixed-time AI influenced pregnancy rates. Furthermore, uterine environment at time of insemination can influence sperm transport. We hypothesized that preovulatory concentrations of estradiol would influence uterine pH at
J Hillegass et al.
Journal of dairy science, 91(11), 4226-4237 (2008-10-24)
Our objectives were to compare reproductive responses of dairy cows receiving timed artificial insemination (AI) either at 48 or 72 h after induction of luteolysis and supplemented or not with estradiol cypionate (ECP). Holstein cows (971) had their estrous cycles
Danielle K Lewis et al.
Journal of neuroimmunology, 195(1-2), 47-59 (2008-03-11)
Estrogen has been shown to attenuate the inflammatory response following injury or lipopolysaccharide treatment in several organ systems. Estrogen's actions are transduced through two estrogen receptor sub-types, estrogen receptor (ER) -alpha and estrogen receptor-beta, whose actions may be overlapping or
Ocilon Gomes Sá Filho et al.
Animal reproduction science, 112(1-2), 95-106 (2008-05-13)
Three experiments evaluated effects of estradiol (E(2)) and/or progesterone (P(4)) prior to induction of ovulation with GnRH on subsequent luteal lifespan in anestrous Nelore cows. In Experiment 1, cows (25-65 days post-partum [DPP]; n=114) were assigned randomly to receive a
K N Galvão et al.
Journal of dairy science, 90(9), 4240-4252 (2007-08-19)
The objectives of this study were to evaluate the effect of 3 methods of resynchronization of estrus and ovulation for lactating dairy cows of unknown pregnancy status on conception rate and time to pregnancy. Holstein cows (n = 495) were
G M Tiboni et al.
Human reproduction (Oxford, England), 24(11), 2688-2692 (2009-07-30)
The aromatase inhibitor, letrozole, exerts embryo toxic effects in rats, causing increased embryo lethality and anomalies of the axial skeleton at pharmacologically relevant doses. Letrozole acts by inhibiting estrogen biosynthesis. It may thus be feasible that estrogen deprivation is a
Marcos G Colazo et al.
The Canadian veterinary journal = La revue veterinaire canadienne, 48(1), 49-56 (2007-02-22)
The objective was to optimize rebreeding of nonpregnant, previously inseminated beef cattle. In Experiment 1, 43 cows received a used intravaginal progesterone-releasing insert (IVPRI; Days 0-7) 12.3 d after ovulation and received concurrently no treatment, 100 microg gonadotropin releasing hormone
M S Gulay et al.
Journal of dairy science, 92(8), 3815-3818 (2009-07-22)
The objective was to determine the effect of supplemental estrogen (estradiol cypionate, ECP) at dry-off on temporal changes in concentrations of lactose in blood plasma of Holstein cows as an indicator of rate of mammary involution. Thirty-two Holstein cows (8/group)
José Alfredo Sierra-Ramírez et al.
Contraception, 84(6), 565-570 (2011-11-15)
The efficacy of contraceptives is affected by its route and ease of administration. Herein, both pharmacokinetics and pharmacodynamics of the once-a-month combined injectable contraceptive medroxyprogesterone acetate (MPA) plus estradiol cypionate (E(2)-Cyp) were compared after intramuscular (IM) or subcutaneous (SC) injection
A H Souza et al.
Theriogenology, 72(1), 10-21 (2009-03-10)
The objectives were to evaluate the effects of equine chorionic gonadotropin (eCG) supplementation (with or without eCG) and type of ovulatory stimulus (GnRH or ECP) on ovarian follicular dynamics, luteal function, and pregnancies per AI (P/AI) in Holstein cows receiving
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